Legalized discrimination in south africa was called

Apartheid

Explanation:

The legal discrimination based on the race and the castism in the south African people was named as Apartheid as it was the radical segregation and the discrimination of the people based on their color and the caste they belonged. This was a  type of the codified system and a racial stratification of the people based on their identity and prohibited people from obtaining a good standard of life and later resulted in as a movement of the freedom and the democratic right of the people led by the nelson Mandela.